Stylus bar



' m1a;1 o. RGRASS I a STYLUS BAR Filed June /1923 Patented Aug. 4, v 1925.

* UNITED. STATES PATENTOFFICE.

OTTO It. GRASS, OF CHICAGO, ILLINOIS AS'SIGNOR TO THE OED-TONE COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS! STYLUS BAR,

Application filed June 18,

T 0 all whom it may concern:

Be it known that I, Or'ro R. Gauss, acitizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Stylus Bars, of which the following is a specification.

This invention relates to a new and improved stylus bar and more particularly to a stylus bar comprising a plurality of ele-@ ments which are yieldingly urged into engagement with supporting pivots.

The usual form of stylus bar comprises a single integral member having a pivot portion adapted to be engaged by spaced pivots. When assembling the sound box and stylus bar, the pivots are adjusted to engagethe stylus bar to permit proper pivoting of the bar without binding and without looseness. Relatively new or green sound box castings are often used and when such castings assume their ultimate dimensions there may be undue tightness of the pivots or there may be a looseness which will cause blast and distortion. There is also variation in the distance between pivots due to changes caused by variations in temperature.

It is an object of the present invention to provide a stylus bar composed of a plural ity of parts yieldingly forced into engagement with spaced pivots whereby variation in pivot distance is automatically taken care of.

It is a further object to provide a construction of this character in which one of the stylus bar members receive the other within a recess formed in the first member.

It is an additional object to provide a construction of this character which is sim ple in design and adapted for rapid commercial production.

Other and further objects will appear as the description proceeds.

I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which:

Figure 1 is a face view of a sound boX with my improved stylus bar mounted thereon;

Figure 2 is a section on an enlarged scale taken on line 22 of Figure 1.

The sound box as shown comprises the body portion 11 having the spaced pivot supports 12 and 12 extending therefrom. The sound box is provided with a usual dia- 1923. Serial No. 646,026.

phragm 13 to which is secured 14; the up- 7 per end of the stylus bar 15. The stylus bar is provided with the pivot portion 15 shown in cross section in Figure 2. The portion 16 is provided with the conical pivot seat 17 which is engaged by pivot screw 18 carried in pivot support 12.

The portion 16 is also provided with the cylindrical recess 19 into the bottom of which is fitted the coil spring 20. The cylindrical member 21 fits into the recess 19 upon the coil spring and is provided upon its outer end with a seat engaging the pivot screw 22 carried in pivot support 12.

In assembling the device, the coilspring is placed in the recess and the cylindrical member seated thereon. The pivot portion is then placed between the pivot screws 18 and 22 and the latter are adjusted into engagement with the seats upon the two stylus bar elements. The spring 20 is preferably relatively stiff and thrusts the two elements yieldingly into engagement with the screws.

The spring is capable of taking up a considerable variation in the adjustment of the two pivot screws and consequently the stylus bar will be properly supported even though there be changes in the relation between the pivot supports due to any cause or causes.

The device is composed of but few and relatively simple parts and is adapted for rapid commercial production. I have shown a preferred form by way of illustration, but contemplate such changes as come within the scope of the appended claims.

I claim:

1. In combination with a sound box, spaced stylus bar supports carried by said box, and a stylus ting between and engaging said supports, said stylus bar comprising separate elements, and yielding means urging said separate elements into engagement with said supports.

2. In combination with a sound box, spaced stylus bar supports carried by said bo and a stylus bar having a portion fitting between and engaging said supports, said stylus bar comprising separate elements, one of said elements fitting in a recess in the other element, and yielding means urging said separate elements into engagement with said supports.

3. In combination with a sound boX,

paced s ylus bar supports carried by said bar having a portion fitbox, and a stylus bar having a portion fitting between and engaging said supports, said stylus bar comprising separate elements, one of said elements fitting in a recess in the other element, and a spring in said recess urging said separate elements into engagement With said supports.

4. As an article of manufacture, a composite stylus bar comprising a transverse pivot portion, one end of which is adapted to engage a pivot, a recess in the opposite end 0 said pivot portion, a member slidably fitted in said recess, and means adapted to yieldingly urge said member into engagement With a pivot.

5. As an article of manufacture, a composite stylus bar comprising a transverse pivot portion, one end of which is adapted to engage a pivot, a cylindrical recess in the opposite end of said pivot portion, a coil spring in said recess, and a cylindrical member slidably fitted in said recess upon said spring and adapted to engage a pivot.

Signed at Chicago, Illinois, this 15 day of June, 1923.

OTTO R. GRASS. 

